Question

please explain solid answers only!

Terpenes and carotenoids are biosynthesized from which lipids?

   isoprenoids OR triacylglycerols

Which of the following statements best describes the Na-glucose transporter of the intestinal epithelia?

A. The active transport mechanism transports both glucose and Na into the intestinal lumen.

B. The passive transport mechanism transports both glucose and Na into the intestinal lumen.

C. The active transport mechanism transports both glucose and Na into the intestinal epithelia.

Answer 1

Terpenes and carotenoids are synthesized from isoprenoids. Terpenes are a class of natural products built up from isoprene units so are also called as isoprenoids. These can be mono-, di-, tri- , tetra-, or poly terpenoids. Carotenoids are formed from tetraterpenes.

The Na-glucose transporter of the intestinal epithelia is best described by C. The Na-glucose transporter acts as a symporter which allows sodium ions and glucose to enter the cell together. The Na⁺ flows down the concentration gradient while the glucose molecules are transported against their concentration gradient.